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A General and High‐Yield Galvanic Displacement Approach to AuM (M=Au, Pd, and Pt) Core–Shell Nanostructures with Porous Shells and Enhanced Electrocatalytic Performances
Author(s) -
Kuai Long,
Geng Baoyou,
Wang Shaozhen,
Sang Yan
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201200893
Subject(s) - nanostructure , materials science , overpotential , catalysis , nanoparticle , nanotechnology , galvanic cell , chemical engineering , porosity , electrochemistry , chemistry , composite material , metallurgy , electrode , organic chemistry , engineering
In this work, we utilize the galvanic displacement synthesis and make it a general and efficient method for the preparation of AuM (M=Au, Pd, and Pt) core–shell nanostructures with porous shells, which consist of multilayer nanoparticles. The method is generally applicable to the preparation of AuAu, AuPd, and AuPt core–shell nanostructures with typical porous shells. Moreover, the AuAu isomeric core–shell nanostructure is reported for the first time. The lower oxidation states of Au I , Pd II , and Pt II are supposed to contribute to the formation of porous core–shell nanostructures instead of yolk‐shell nanostructures. The electrocatalytic ethanol oxidation and oxygen reduction reaction (ORR) performance of porous AuPd core–shell nanostructures are assessed as a typical example for the investigation of the advantages of the obtained core–shell nanostructures. As expected, the AuPd core–shell nanostructure indeed exhibits a significantly reduced overpotential (the peak potential is shifted in the positive direction by 44 mV and 32 mV), a much improved CO tolerance ( I f / I b is 3.6 and 1.63 times higher), and an enhanced catalytic stability in comparison with Pd nanoparticles and Pt/C catalysts. Thus, porous AuM (M=Au, Pd, and Pt) core–shell nanostructures may provide many opportunities in the fields of organic catalysis, direct alcohol fuel cells, surface‐enhanced Raman scattering, and so forth.